here is the modified "Tango" theme with library and dictionary link in the reduced main menu. The names differs from the other Tangos (Tango_m-b and Tango_m-w). So you have to change the Theme to activate them.

If you extract the zip file you will see where you have to copy which file. In "en.txt" you can customize the button text i.e. "My application". In custom_app.app you can customize the link. You will find there some examples and the default is the browser with google.

I did an update: Now there are themes Crystal_m where you will see Photos instead of Bookstore in main menu and where you can customize the right button of the unwrapped main menu. Also there is a new on-/off-switch.